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<Title>Line with Error Symbols</Title>
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<p class="heading0">ChartDirector 7.0 (Java Edition)</p>
<p class="heading1">Line with Error Symbols</p>
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<img src="images/errline.png" width='600' height='300'>
<br><br>
This example demonstrates combining a line layer with a box-whisker layer to draw a line with error symbols.<br><br>
The blue line and the yellow diamond symbols are from the line layer, created using <a href="XYChart.addLineLayer2.htm">XYChart.addLineLayer2</a>, <a href="Layer.addDataSet.htm">Layer.addDataSet</a>, and <a href="DataSet.setDataSymbol.htm">DataSet.setDataSymbol</a>.<br><br>
The error symbols come from the box-whisker layer, created using <a href="XYChart.addBoxWhiskerLayer.htm">XYChart.addBoxWhiskerLayer</a>. In this example, the "box" parts of the box- whisker symbols are disabled by setting the data for the box and median to empty arrays. As a result, only the "whisker" parts of the box-whisker symbols are visible and they become the error symbols.<br><br>
The maximum and minimum marks in this example is computed by adding/subtracting the error value to/from the data value using a ChartDirector utility class <a href="ArrayMath.htm">ArrayMath</a>.
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<p class="heading1a">Source Code Listing</p>
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<b>[JSP Version]</b> jspdemo/errline.jsp
<div class='codeblock'><code class='pre'>&lt;%@page import="ChartDirector.*, java.util.*" %&gt;
&lt;%
// The data with error information
double[] data = {42, 49, 33, 38, 51, 46, 29, 41, 44, 57, 59, 52, 37, 34, 51, 56, 56, 60, 70, 76, 63,
    67, 75, 64, 51};
double[] errData = {5, 6, 5.1, 6.5, 6.6, 8, 5.4, 5.1, 4.6, 5.0, 5.2, 6.0, 4.9, 5.6, 4.8, 6.2, 7.4,
    7.1, 6.0, 6.6, 7.1, 5.3, 5.5, 7.9, 6.1};

// The labels for the chart
String[] labels = {"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", "14",
    "15", "16", "17", "18", "19", "20", "21", "22", "23", "24"};

// Create a XYChart object of size 600 x 300 pixels, with a light grey (eeeeee) background, black
// border, 1 pixel 3D border effect and rounded corners.
XYChart c = new XYChart(600, 300, 0xeeeeee, 0x000000, 1);
c.setRoundedFrame();

//Set search path to current JSP directory for loading icon images
c.setSearchPath(getServletConfig().getServletContext(), request);

// Set the plotarea at (55, 55) and of size 520 x 195 pixels, with white (ffffff) background. Set
// horizontal and vertical grid lines to grey (cccccc).
c.setPlotArea(55, 55, 520, 195, 0xffffff, -1, -1, 0xcccccc, 0xcccccc);

// Add a title box to the chart using 15pt Times Bold Italic font. The title is in CDML and includes
// embedded images for highlight. The text is on a light grey (dddddd) background, with glass
// lighting effect.
c.addTitle(
    "&lt;*block,valign=absmiddle*&gt;&lt;*img=star.png*&gt;&lt;*img=star.png*&gt; Molecular Temperature Control " +
    "&lt;*img=star.png*&gt;&lt;*img=star.png*&gt;&lt;*/*&gt;", "Times New Roman Bold Italic", 15).setBackground(
    0xdddddd, 0, Chart.glassEffect());

// Add a title to the y axis
c.yAxis().setTitle("Temperature");

// Add a title to the x axis using CMDL
c.xAxis().setTitle("&lt;*block,valign=absmiddle*&gt;&lt;*img=clock.png*&gt;  Elapsed Time (hour)&lt;*/*&gt;");

// Set the labels on the x axis.
c.xAxis().setLabels(labels);

// Display 1 out of 3 labels on the x-axis. Show minor ticks for remaining labels.
c.xAxis().setLabelStep(3, 1);

// Set the axes width to 2 pixels
c.xAxis().setWidth(2);
c.yAxis().setWidth(2);

// Add a line layer to the chart
LineLayer lineLayer = c.addLineLayer2();

// Add a blue (0xff) data set to the line layer, with yellow (0xffff80) diamond symbols
lineLayer.addDataSet(data, 0x0000ff).setDataSymbol(Chart.DiamondSymbol, 12, 0xffff80);

// Set the line width to 2 pixels
lineLayer.setLineWidth(2);

// Add a box whisker layer to the chart. Use the upper and lower mark of the box whisker layer to
// act as error zones. The upper and lower marks are computed using the ArrayMath object.
BoxWhiskerLayer errLayer = c.addBoxWhiskerLayer(null, null, new ArrayMath(data).add(errData).result(
    ), new ArrayMath(data).sub(errData).result(), data, Chart.Transparent, 0xbb6633);

// Set the line width to 2 pixels
errLayer.setLineWidth(2);

// Set the error zone to occupy half the space between the symbols
errLayer.setDataGap(0.5);

// Add a custom CDML text at the bottom right of the plot area as the logo
c.addText(575, 247,
    "&lt;*block,valign=absmiddle*&gt;&lt;*img=small_molecule.png*&gt; &lt;*block*&gt;&lt;*font=Times New Roman Bold " +
    "Italic,size=10,color=804040*&gt;Molecular\nEngineering&lt;*/*&gt;").setAlignment(Chart.BottomRight);

// Output the chart
WebChartViewer viewer = new WebChartViewer(request, "chart1");
viewer.setChart(c, Chart.SVG);

// Include tool tip for the chart. We only need to show the tool tip for the box whisker layer.
viewer.setImageMap(errLayer.getHTMLImageMap("", "",
    "title='Temperature at hour {xLabel}: {med} +/- {={med}-{min}} C'"));
%&gt;
&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
    &lt;title&gt;Line with Error Symbols&lt;/title&gt;
    &lt;!-- Include ChartDirector Javascript Library to support chart interactions --&gt;
    &lt;script type="text/javascript" src="cdjcv.js"&gt;&lt;/script&gt;
&lt;/head&gt;
&lt;body style="margin:5px 0px 0px 5px"&gt;
    &lt;div style="font:bold 18pt verdana;"&gt;
        Line with Error Symbols
    &lt;/div&gt;
    &lt;hr style="border:solid 1px #000080; background:#000080" /&gt;
    &lt;div style="font:10pt verdana; margin-bottom:1.5em"&gt;
        &lt;a href="viewsource.jsp?file=&lt;%=request.getServletPath()%&gt;"&gt;View Source Code&lt;/a&gt;
    &lt;/div&gt;
    &lt;!-- ****** Here is the chart image ****** --&gt;
    &lt;%= viewer.renderHTML(response) %&gt;
&lt;/body&gt;
&lt;/html&gt;</code></div>
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